It's perfectly normal that you're period was off by a few days. That is why they tell you to wait a week before you test because your period can start at anytime during that week. Also just because you had unprotected sex does not mean that you will get pregnant right away. It can take up to a year for normal healthy couples to conceive. It took me and my husband 7 months.
Then just do as your doctor says he can tell you more than us through a website. You did say you started bleeding and I believe that you are having your period. And I'm sure that your doctor will tell you the same thing.
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